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|
//! Parse and display Markdown.
//!
//! You can enable the `highlighter` feature for syntax highligting
//! in code blocks.
//!
//! Only the variants of [`Item`] are currently supported.
use crate::core::font::{self, Font};
use crate::core::padding;
use crate::core::theme::{self, Theme};
use crate::core::{self, Element, Length};
use crate::{column, container, rich_text, row, span, text};
/// A Markdown item.
#[derive(Debug, Clone)]
pub enum Item {
/// A heading.
Heading(Vec<text::Span<'static>>),
/// A paragraph.
Paragraph(Vec<text::Span<'static>>),
/// A code block.
///
/// You can enable the `highlighter` feature for syntax highligting.
CodeBlock(Vec<text::Span<'static>>),
/// A list.
List {
/// The first number of the list, if it is ordered.
start: Option<u64>,
/// The items of the list.
items: Vec<Vec<text::Span<'static>>>,
},
}
/// Parse the given Markdown content.
pub fn parse(
markdown: &str,
palette: theme::Palette,
) -> impl Iterator<Item = Item> + '_ {
let mut spans = Vec::new();
let mut heading = None;
let mut strong = false;
let mut emphasis = false;
let mut link = false;
let mut list = Vec::new();
let mut list_start = None;
#[cfg(feature = "highlighter")]
let mut highlighter = None;
let parser = pulldown_cmark::Parser::new(markdown);
// We want to keep the `spans` capacity
#[allow(clippy::drain_collect)]
parser.filter_map(move |event| match event {
pulldown_cmark::Event::Start(tag) => match tag {
pulldown_cmark::Tag::Heading { level, .. } => {
heading = Some(level);
None
}
pulldown_cmark::Tag::Strong => {
strong = true;
None
}
pulldown_cmark::Tag::Emphasis => {
emphasis = true;
None
}
pulldown_cmark::Tag::Link { .. } => {
link = true;
None
}
pulldown_cmark::Tag::List(first_item) => {
list_start = first_item;
None
}
pulldown_cmark::Tag::CodeBlock(
pulldown_cmark::CodeBlockKind::Fenced(_language),
) => {
#[cfg(feature = "highlighter")]
{
use iced_highlighter::{self, Highlighter};
use text::Highlighter as _;
highlighter =
Some(Highlighter::new(&iced_highlighter::Settings {
theme: iced_highlighter::Theme::Base16Ocean,
token: _language.to_string(),
}));
}
None
}
_ => None,
},
pulldown_cmark::Event::End(tag) => match tag {
pulldown_cmark::TagEnd::Heading(_) => {
heading = None;
Some(Item::Heading(spans.drain(..).collect()))
}
pulldown_cmark::TagEnd::Emphasis => {
emphasis = false;
None
}
pulldown_cmark::TagEnd::Strong => {
strong = false;
None
}
pulldown_cmark::TagEnd::Link => {
link = false;
None
}
pulldown_cmark::TagEnd::Paragraph => {
Some(Item::Paragraph(spans.drain(..).collect()))
}
pulldown_cmark::TagEnd::List(_) => Some(Item::List {
start: list_start,
items: list.drain(..).collect(),
}),
pulldown_cmark::TagEnd::Item => {
list.push(spans.drain(..).collect());
None
}
pulldown_cmark::TagEnd::CodeBlock => {
#[cfg(feature = "highlighter")]
{
highlighter = None;
}
Some(Item::CodeBlock(spans.drain(..).collect()))
}
_ => None,
},
pulldown_cmark::Event::Text(text) => {
#[cfg(feature = "highlighter")]
if let Some(highlighter) = &mut highlighter {
use text::Highlighter as _;
for (range, highlight) in
highlighter.highlight_line(text.as_ref())
{
let span = span(text[range].to_owned())
.color_maybe(highlight.color())
.font_maybe(highlight.font());
spans.push(span);
}
return None;
}
let span = span(text.into_string());
let span = match heading {
None => span,
Some(heading) => span.size(match heading {
pulldown_cmark::HeadingLevel::H1 => 32,
pulldown_cmark::HeadingLevel::H2 => 28,
pulldown_cmark::HeadingLevel::H3 => 24,
pulldown_cmark::HeadingLevel::H4 => 20,
pulldown_cmark::HeadingLevel::H5 => 16,
pulldown_cmark::HeadingLevel::H6 => 16,
}),
};
let span = if strong || emphasis {
span.font(Font {
weight: if strong {
font::Weight::Bold
} else {
font::Weight::Normal
},
style: if emphasis {
font::Style::Italic
} else {
font::Style::Normal
},
..Font::default()
})
} else {
span
};
let span = span.color_maybe(link.then_some(palette.primary));
spans.push(span);
None
}
pulldown_cmark::Event::Code(code) => {
spans.push(span(code.into_string()).font(Font::MONOSPACE));
None
}
pulldown_cmark::Event::SoftBreak => {
spans.push(span(" "));
None
}
pulldown_cmark::Event::HardBreak => {
spans.push(span("\n"));
None
}
_ => None,
})
}
/// Display a bunch of Markdown items.
///
/// You can obtain the items with [`parse`].
pub fn view<'a, Message, Renderer>(
items: impl IntoIterator<Item = &'a Item>,
) -> Element<'a, Message, Theme, Renderer>
where
Message: 'a,
Renderer: core::text::Renderer<Font = Font> + 'a,
{
let blocks = items.into_iter().enumerate().map(|(i, item)| match item {
Item::Heading(heading) => container(rich_text(heading))
.padding(padding::top(if i > 0 { 8 } else { 0 }))
.into(),
Item::Paragraph(paragraph) => rich_text(paragraph).into(),
Item::List { start: None, items } => column(
items
.iter()
.map(|item| row!["•", rich_text(item)].spacing(10).into()),
)
.spacing(10)
.into(),
Item::List {
start: Some(start),
items,
} => column(items.iter().enumerate().map(|(i, item)| {
row![text!("{}.", i as u64 + *start), rich_text(item)]
.spacing(10)
.into()
}))
.spacing(10)
.into(),
Item::CodeBlock(code) => {
container(rich_text(code).font(Font::MONOSPACE).size(12))
.width(Length::Fill)
.padding(10)
.style(container::rounded_box)
.into()
}
});
Element::new(column(blocks).width(Length::Fill).spacing(16))
}
|
